A place like the Right Livers' Rest was bound to draw freaks, same as molasses draws flies. 1935, George Goodchild, chapter 5, in Death on the Centre Court: By one o'clock the place was choc-a-bloc.
Swallowing certain types of poisons may cause excessive salivation. According to the National Library of Medicine, pesticides can cause excessive saliva when they are swallowed. Venom from snake bites or insect stings is another type of poisoning that can cause the malady.
This is not an exact answer to your question, but I feel that many people underestimate the role saliva plays in our lives. 1. Clearance of pathogens: on average, a human being will produce 1.5 liters of saliva per day. Since the saliva is rich in glycoprotein, these will help make the bacteria stick together and ease their clearance from the oral cavity into the stomach, where they will most likely be killed by the acidic environment.